Genie S125 Hydraulic Pump Repair in Ames, Iowa
When a Genie S125 boom lift won’t raise or the platform drifts down on its own, the hydraulic pump is usually the first thing we check. We’ve done Genie S125 hydraulic pump repair on machines that came in dead in the yard, wouldn’t build pressure, or were leaking gear oil out the shaft seal onto the frame rail. This isn’t a machine we read about in a manual — we’ve had them up on the lift here at 210 Freel Dr, pump off, housing split, checking gear wear with a feeler gauge.
How We Handle Genie S125 Hydraulic Pump Repair
Every Genie S125 hydraulic pump repair starts the same way: we hook up a flow meter and pressure gauge before we touch a wrench. That tells us whether we’re chasing a bad gear pump, a stuck relief valve, or something further downstream in the lift or drive circuit. If the pump itself is the problem, we pull it, drain the case, and inspect the gears, bushings, and shaft seal for scoring or wear.
- Pressure and flow test on the machine before removal, so we’re not guessing
- Pull the gear pump, inspect gears, bushings, and PTO coupling for wear
- Rebuild with new bearings, seals, and gears when the housing is still good
- Full replacement with a new 15 GPM gear pump when the case is scored or cracked
- Reset and test the relief valve, typically adjustable up to 7000 PSI depending on circuit
- Road test the boom through full range before it leaves our shop
Most of the time on a Genie S125, we’re dealing with a gear-style pump running off a PTO hub, and we keep stub shafts, hub kits, and relief valve sets on hand because we see this failure pattern often enough to stock for it. If your machine is part of a bigger fleet, our material handling hydraulic repair work covers scissor lifts and forklifts too, not just booms.
Common Symptoms That Point to a Bad Pump
Not every slow boom or noisy lift means the pump is bad, but a handful of symptoms show up again and again on the Genie S125 units we service. If the platform creeps down under its own weight when parked, that’s often a worn pump losing internal seal against the relief valve, not the cylinder. If the boom won’t lift at all but the engine runs fine, we’re looking at a pump that’s lost its prime or sheared its coupling.
A whining or grinding noise from the pump housing usually means the gears are chewed up inside, and by the time you hear it, metal is already circulating through your hydraulic fluid. That contaminated fluid can take out your valves and cylinders next if it’s not caught. We’ve written more on this exact failure mode over at our page on a hydraulic pump not building pressure, which covers a lot of the same diagnostic steps we run on a Genie S125.
Symptom Checklist
Here’s what we ask customers before they even bring the machine in for Genie S125 hydraulic pump repair:
- Does the boom drift down when parked and shut off?
- Is there a whine, grind, or knock from the pump area?
- Does the lift function respond slow, or not at all?
- Is there visible fluid on the ground under the pump housing?
- Has the hydraulic fluid gone dark or smell burnt?
How Much Does Genie S125 Hydraulic Pump Repair Cost
Cost depends heavily on whether we can rebuild your existing pump or need to replace it outright. A medium rebuild — new bearings, seals, and gear set pressed into a housing that’s still in good shape — typically runs $450 to $900 in parts and labor. A full gear pump replacement, including a new 15 GPM unit, fittings, hose barbs, and shop labor, generally lands between $1,200 and $2,200 depending on hub configuration and whether the PTO stub or coupling also needs replacing.
If you need us to come to your site instead of trailering the S125 in, we add mileage — usually a flat rate for a round trip within 100 miles of our shop, plus a bucket of hydraulic fluid if the system needs a full refill. Shop labor for misc tasks runs on top of parts if there’s more going on than just the pump, like a relief valve that also needs adjusting or replacing. We’ll always tell you upfront if we think the fix is a rebuild versus a full pump swap — we don’t sell a new pump when a rebuild will get you back to full pressure for less.
For comparison, if your S125 also needs cylinder work at the same time, our hydraulic cylinder rebuild cost guide breaks down pricing for that side of the machine, and we can quote both jobs together to save a trip.
Why Bring It to Ames Hydraulics
We’re a family-run shop here in Ames, and Genie S125 hydraulic pump repair is work we do regularly, not a one-off. We keep gear pumps, hub kits, relief valves, and fittings in stock because we’ve seen this exact failure enough times to know what to have on the shelf. Whether your S125 is on a construction site, a rental yard, or parked behind a warehouse, we can pull the pump, rebuild or replace it, and get pressure back where it needs to be.
If your Genie S125 won’t lift, is drifting down, or is making noise you don’t like, don’t wait for it to strand a crew mid-job. Call us at 515-292-2599 and tell us what the machine is doing — we’ll walk you through next steps and get you scheduled for Genie S125 hydraulic pump repair.
Frequently Asked Questions
How do I know if my Genie S125 pump is bad or if it’s the valve?
We run a pressure and flow test before pulling anything apart. A pump that’s worn internally will show low flow across the board, while a bad relief valve usually shows normal flow but pressure that won’t hold or climbs too high. This is the first step in any Genie S125 hydraulic pump repair we do.
Can you rebuild my existing pump instead of replacing it?
Often, yes. If the housing isn’t scored or cracked, we can rebuild it with new gears, bushings, and seals for less than a full replacement. We’ll inspect it first and give you both options with pricing before we start work.
How long does Genie S125 hydraulic pump repair take?
A straightforward rebuild can often be turned around in a day or two once we have the pump apart and parts confirmed. Full replacements depend on parts availability, but we keep common gear pumps and hub kits in stock to speed that up.
Do you come out to our site or does the machine need to come to the shop?
We can do either. Many customers trailer the S125 in, but we also travel to job sites and yards, typically charging a mileage rate for trips within 100 miles of our shop in Ames.
What does it cost to fix a leaking hydraulic pump on a Genie S125?
A rebuild with new seals and bearings usually runs $450 to $900. If the pump housing is too worn or scored to reuse, a full replacement with a new gear pump and fittings runs $1,200 to $2,200 depending on the coupling setup.
Written by Josiah Ragsdale, Ames Hydraulics